Anthraquinone dyestuffs



Patented Aug. 15, 1944 ANTHRAQUINONE DYESTUFFS Francis Irving and Henry Alfred Piggctt, Blackley, Manchester, England, assignors to Imperial Chemical Industries Limited, a corporation of Great Britain N Drawing. Application January 5, 1943, Serial No. 471,368. In Great Britain February 2, 1942 3 Claims.

The present invention relates to the manufacture of new vat dyestuffs of th anthraquinone series. More particularly this invention relates to making vat dyestuffs which are 1:4-dibenzoylaminoanthraquinones in which at least one of the 5 benzoyl nuclei carries a phenylalkanesulphonyl only one phenylalkanesulphonyl group is desired, p- 1-amino-4benzoylaminoanthraquinone can be It has been proposed to obtain dyestuffs, which acylated with one molecular proportion of the re-. yield on cotton bright scarlet to red dyeings, by q'uired phenylalkanesulphonylbenzoyl chloride. introducing into the 1- and 4-positions of the Alternatively 1-halogeno-4benzoylaminoanthraanthraquinone molecule two aroylamino groups, quinone may be caused to react With one molecat least one being a m-'-alkane-su1phony1benzoylu1ar proportion of the phenylalkanesulphonyla o upbenzamide. The latter may also be made to in-, Also i 011 p g pp ation No. 443,650 teract in the presence of hydrogen chloride with it has been proposed to manufacture new an- 1-amino-4benzoylaminoanthraquinone. thraquinone vat dyestuffs with similar excellent It is proposed to introduce those phenylalkaneproperties to those of the prior proposal, but sulphonylbenzoylamino groups in which the a]- with a superior colour value, by introducing into kaiie group contains from 1 to 3 carbon atoms. the 1- and 4-positions of the anthraquinone Suitable phenylalkanesulp y oy o molecule two aroylamino groups, at least one phenylalkanesulphonylbenzamides which may be being a palkanesulphonylbenzoylamino group, used are for example those obtainable from the in which the alkane group has not more than 4 following phenylalkanesulphonylbenzoic acids: Carbon atoms and may be normal or pPhenylmethanesulphonylbenzoic acid, M. P.

We have now found that new anthraquinone t 267 C. (from p-sulphinobenzoic acid and dyestuffs of very good fastness properties and benzyl chloride) paytlculariy reS1St?nt.t0 kler'bolhpg are m-Phenylmethanesulphonyl benzoic acid, M. P. tained by introducing into anthraquinone or into C (from m sulphinobenzoic acid and 1benzoylaminoanthraquinone, phenylalkanesulphonylbenzoylamino groupings benzyl chlonde) 4 (o chlorophenylmethanesulphonyl) benzo c According to the invention l-phenylalkanesula acid, M. P. 254 C. (from p-sulphinobenzoic phonylbenzoylamino 4 benzoylamino anthraacid and o-chlorobenzyl chloride) quinones ar manufactured by introducin into 4-(p-tolylmethanesulphonyl)benzoic acid, M. P. 1benzoylammoanthraquinone, in the manner C (from sulphinobenzoic acid and hereinbelow described, phenylalkanesulphonyh th l 3 benzoylamino groups wherein the phenyl residue me y E c on 4 (p metrioxyphenylmethanesulphonyl(benzoic may carry as substituents alkoxyl, alkyl or halo- M P 0 (f 1 b gen. These compounds have the general t rom p m0 enzolc formula: acid and p-methoxybenzyl chloride) 4-(p-phenylethanesulphonyl)benzoic acid, M. P. d 40 239 C. (from p-sulphinobenzoic acid and (u) HlTTO c-phenylethyl bromide) --SOz-alkylen 4-(' -phenylpropanesulphonyl)benzoic acid, M. P. V 201 C. (from p-sulphinobenzoic acid and 'y-phenylpropyl bromide) 4-(a-phenylethanesulphonyl)benzoic acid, M. P. 224 C. (from sodium p-toluene sulphinate and 0 EF u-phenylethyl bromide, by oxidising with po- 0 tassium permanganate under neutral conditions the p-tolyl-a-phenylethyl sulphone so formed). wherein alkylene stands for an alkylene radical which contains from 1 to 3 carbon atoms and X The p-sulphinobenzoic acid used in the prepastands for a substituent of the group consisting r ti n f the abov ph alka u p l of I-I, Cl, CH3, and -OCH3. zoic acids may be prepared from p-chlorosul- The introduction of the said phenylalkanesulphonylbenzoic acid as described in J. C. S., 1922,

phonylbenzoylamino groups may be efiected by causing the corresponding benzoyl halide or (in the presence of hydrogen chloride) benzamide to react with the necessary amino-substituted anthi'aquinone or thesaid benzainide with the necessary halogen-substituted anthraquinone. If

The Vat dyestufis of the present invention dye cotton in bright bluish red to scarlet shades.

The following examples in which parts are by weight illustrate but do not limit the invention.

Example 1 9 parts of p-phenylmethanesulphonylbenzoic acid are converted to the acid chloride by heating with 150 parts of nitrobenzene and 7 parts of thionyl chloride at 100 C. with stirring under a The mixture is boiled for 1% hours under a re-v flux condenser. After cooling, the separated material is filtered ofi, washed with nitrobenzene and then freed from nitrobenzene by boiling with water in a current of steam. The so-obtained dyestuff dyescotton from a bluish-grey alkaline hydrosulphite vat in bright bluish red shades having excellent fastness. properties. The dyestufi" is soluble in concentrated sulphuric acid, yielding a red solution...

The same dyestuff is obtained by interaction of p-phenylmethanesulphonylbenzamide, M. P, 275 C., with 1-amino-4-benzoylamino-anthraquinone in the presence of hydrogenchloride, and it is also obtained by condensation of p-phenylmethanesulphonylbenzamide with l-chlorol-benzoylamino-anthraquinone in the presence of nitrobenzene; an acid-binding agent and a copper catalyst. 7

Example 2 9 parts of m-phenylmethanesulphonylbenzoic acid areconverted to the acid chloride and then caused to interact with 10 parts of I-amino- 4-10enzoylaminoanthraquinone as in Example 1.

The resulting dyestufi dyes cotton in red shades, somewhat yellower than those given by the product of Example 1 and having excellent fastness properties.

Example 3 10 parts of 4- (achlorophenylmethanesulphonyl) benzoic acid are converted to the corren sponding acid chloride and then reacted with 10 parts of 1-aminol-benzoylamino-anthraquinone in the manner described in Example 1. The

' resulting dyestufi dyes cotton in scarlet shades having excellent fastness properties.

We claim: 1. The compounds of the formula:

wherein alkylene stands for an alkylene radical which contains from 1 to 3 carbon atoms and X stands for a substituent of the group consistin of H, -Cl, CH3, and -OCH3.

2. 1 phenylalkanesulphonylbenzoylamino 4 benzoylaminoanthraquinones.

3. 1 phenylmethanesulphonylbenzoylamino-4- benzoylaminoanthraquinone.

' FRANCIS IRVING.

HENRY ALFRED PIGGOTT. 

